Percents — Practice
Per cent means per hundred, so every percent is a fraction with a hundred underneath.
What these questions cover
These questions use 2 ideas from the course. Follow any of them for a definition, where it is taught, and what it leads to.
- Percent — Parts per hundred. 37% = 37100 = 0.37.
- Percent increase — How much something grew, as a percentage of what it was.
Problem 1
Write 63% as a decimal.
Worked answer
0.63
Move the point two places left
Problem 2
Write 0.4 as a percent. Give just the number.
Worked answer
40
0.4 × 100 = 40
Problem 3
Find 25% of 80.
Worked answer
20
80 ÷ 4 = 20
Problem 4
Find 10% of 340.
Worked answer
34
34.0
Problem 5
Find 50% of 96.
Worked answer
48
96 ÷ 2 = 48
Problem 6
Find 35% of 60.
Worked answer
21
10% = 6, so 30% = 18
5% = 3
18+3 = 21
Problem 7
Find 15% of 240.
Worked answer
36
24 + 12 = 36
Problem 8
A $60 coat is reduced by 20%. Find the sale price.
Worked answer
48
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Problem 9
A $45 game is reduced by 10%. Find the sale price.
Worked answer
40.5
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Problem 10
A $80 price rises by 15%. Find the new price.
Worked answer
92
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Problem 11
Write 35 as a percent. Give just the number.
Worked answer
60
60100
Problem 12
A price rises from $40 to $52. Find the percent increase.
Worked answer
30
Change = 12
1240 = 0.3
Problem 13
A price falls from $50 to $35. Find the percent decrease.
Worked answer
30
Change = 15
1550 = 0.3
Problem 14
After 25% off, a game costs $36. What was the original price?
Worked answer
48
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Problem 15
30% of a number is 21. Find the number.
Worked answer
70
21 ÷ 0.3 = 70
Problem 16
A $100 item rises 20% then falls 20%. What is the final price?
- $96
- $100
- $104
- $80
Worked answer
$96
Up to $120
20% of 120 is 24
120-24 = 96